Have cells, use energy, grow and develop, respond to environment, reproduce, and adapt to environment.

The constant balancing of an organism's energy-producing processes and its energy-using processes.

Examples: Breaking down foods, building body parts, transporting materials, and removing wastes.

 Stimulus: A change that occurs in the environment.

Examples: Sound, light, pressure, odors, and temperature changes.

Response: A reaction to a stimulus.

Animals that use food energy to maintain a constant body temperature.

Examples: Birds, dogs, and humans.

Animals that depend on heat energy from the sun for warmth and cannot remain active for long periods without it.

Examples: Fish, frogs, and turtles.

Combinations of chemical symbols are used to represent compounds. These symbols are called CHEMICAL FORMULAS.

Sometimes, a formula represents a molecule of an element, not a compound. Ex. Nitrogen is N.

Organic compounds and inorganic compounds

Organic: Include almost all compounds containing carbon.

Inorganic: Most do not contain carbon. Water and minerals are the main inorganic compounds in Living Things.

Complex molecules made of long chains of amino acids. Cells use proteins to build and repair body parts. Proteins also help speed up chemical reactions and protect the body from disease.

Amino Acids: simple molecules that contain carbon, oxygen, hydrogen, and nitrogen. The specific aminio acids and their arrangement determine the shape of the protein.

Organic compounds that most living things use to store energy. Each carbohydrate molecule is made up of oxygen, hydrogen, and carbon atoms. Carbohydrates are found in potatoes, bread, rice, pasta, and bananas.

Starches and sugar.

A group of organic compounds that contain carbon, hydrogen, and oxygen. Share one physical property, they do not mix with water. Butter, vegetable oil, and animal fats are foods that contain lipids.

Fats, oils, and waxes.

Nucleic Acids

Large organic molecules that store and process the information the cell needs to carry out its activities. The stored info is copied and passed along to new generations as the cells reproduce.

DNA and RNA.

DNA: stores the information and to use the instructions, the cell muust copy portions of the DNA to the RNA.

RNA: then interpreted by other components into the cell.